Centrifugal casting mecahnism



April 1 1924.

J. B. LADD CENTRIFUGAL CASTING MECHANI SM Filed Dec. 29 1922 Patented Apr. 1, 192d.

UNITED STATES 1,489,036 FATENT OFHQEE.

JAMES B. LADD, OF ARDMORE, PENNSYLVANIA, ASSIGNOB TO UNITED STATES CAST IRON PIPE & FOUNDRY GOZMPANY, OF BURLINGTON,

OF NEW JERSEY.

NEW JERSEY, A CORPORATION CENTRIFUGAL CASTING MECEANIW.

Application filed December 29, 1922. Serial No. 609,550.

To all whom it may concern.

Be it known that 1, JAMES B. LADD, a citizen of the United States of America, and resident of Ardmore, in the county of Monta gomery, in the State of Pennsylvania, have invented certain new and useful Improve ments in Centrifugal Casting Mechanism, of

Y which the following is a true and exact description, reference being had to the accompgnying drawings, which form a part there- My invention relates to centrifugal casting mechanism and particularly to mechanism where a core supporting ring is to be 16 detachably secured in the end of the mold so as to supplort a core during the casting operation. he object of my invention is to provide an improved appliance for securing this core ring in position during the casting operation. A further object of my inventionis to provide, in connection with latching mechanism to be described, a driving device such as a pulley by which power can be applied to the mold for rotating it.

The nature of my improvements will be best understood as described in connection with the drawings in which they are illustrated and in which Figure 1 is a sectional elevation of one end of a casting apparatus adapted for casting a bell ended pipe.

Figure 2 is a cross section 22 of Fig. 1.

Figure 3, a sectional view on the line 33 of Fig. 2, and v Figure aisaview generally similar to the construction shown in Fig. 1 but showing a core ring adapted to support a solid metallic core piece instead of the sand core indicated in Fig. 1.

The construction of the metallic core indicated in Fig. 4 is also my invention and on the line forms the subject matter of my copending application.

A indicates the casing of the casting machine which serves also as a water jacket for the mold. B is the mold having a bell mouth indicated at B, a laterally projecting flange indicated at B an outwardl% projecting perforated ring indicated at 3 and a core rin seat indicated at B. G is the core ring aving a seat portion which fits in the conical seat formed at the end of the mold this core ring having, as shown, an

annular conical surface C extending beyond the outer surface of the flange B. D, D, are latches having tapered ends which ex tend through the perforations in the ring B and fit against" the latch receiving surface C of the core ring. These latches are formed with projecting pins, as indicated at D. E, E, indicate packing between the flange B and the casing A. F indicates a sand core supported on the core ring (3.

In the modification illustrated in Fig. 4, an annular metal core piece. indicated at f is supported on the core ring here indicated at 0, this core being at its inner end divided into tongues f by longitudinal slots, also supported on the ring 7 is a ring G having a series of tongues indicated at G project ing toward the core ring and a thin metal shell indicated at H is supported on the tongues f and G, as shown. This special construction forms the subject matter of my co-pending application referred to above and is only shown here as indicating that the core ring may support a metal core as an alternative to a sand core.

J indicates the end of a runner b which molten iron is run into the mold. is an annular plate secured to the flan e B of the mold as by screws indicated at this plate having a crowned surface indicated at K connected with its outer rim and an annular preferably upwardly flared ring K connected with its inner edge. As shown, annular seats K are formed in the plate K connecting with slots K which run in radial directions and in which lie the latches D. M, M, indicate annular shells adapted to be seated in the seats K as shown, having upwardly extending portionsindicated at M and, as shown, grooves M N indicates a pivot pin secured in the shell M, as shown, and on which is pivoted a latch lever O having a counterweighted outer end 0' and a forked inner end 0 which engages the pins extending laterally from the latches D.

Pis a spring acting on the latch lever O, as shown, so as to normally press the latches inward. Q, Q, are locking blocks having flanges which fit into the slot M of the shell M, the blocks being held in place by screws indicated at Q.

In operation the latches are normally pressed inward by the action of the spring which, however, does not exert a force which makes it difiicult to push the latches away in inserting the core ring or in withdrawing the core ring. When the mold is rotated the centrifugal force exerted by the projecting ends 0 of the latch levers O presses the latches in with increasing force making it entirely sure that the core rings and cores'supported on the rings shall not be displaced during the casting operation.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A centrifugal mold having at its end a seat for a core ring in combination with latches secured to the mold for locking the core ring in its seat and counterweighted latch actuating fingers attached to the mold and operating to press the latches in against the core, ring with increasing force as the rotative speed of the mold increases.

2. A centrifugal mold having at its end a conical seat for a core ring in combination with a core ring having a conical seat adapted to fit in the seat in the mold and outer latch engaging surfaces, latches secured to the v mold for locking the core ring in its seat by a wedging action and counterweighted latch actuating fingers attached to the mold and operating to press the latches in against the core ring with increasing force as therotative speed of the mold increases.

3. A centrifugal mold having at its end a seat for a core ring, in combination with a driving pulley secured to the end of the mold and having an internal opening larger in diameter than the greater diameter of the core ring seat, latches for securing the core ring in its seat radially movable at the end of the mold and counterweighted latch actuating fingers pivotally connected to the pully and acting to press the latches inward with increasing force as the speed of rotation increases.

4. A centrifugal mold having at its end a seat for a corering in combination with latches secured to the mold for locking the core ring in its seat, counterweighted latch actuating fingers attached to the mold and operating to press the latches in against the core ring with increasing force as the rotative speed of the mold increases and springs acting on the fingers to press them inward.

5. A centrifugal mold having at its enda seat for a core ring, in combination with a driving pulley secured to the end of the mold and having an internal opening larger in diameter than the greater diameter of the core ring seat, and of conical shape, latches for securing the core ring in its seat radially movable at the end of the mold and counterweighted latch actuating fingers pivotally connected to the pulley and acting to press the latches inward with increasing force as the speed of rotation increases.

JAMES B. LADD. 

